diff --git a/web/app/controllers/contest_resources.php b/web/app/controllers/contest_resources.php
index 710fbf8..66fbb81 100644
--- a/web/app/controllers/contest_resources.php
+++ b/web/app/controllers/contest_resources.php
@@ -19,12 +19,15 @@ $sub_path = UOJRequest::get('sub_path', 'is_string', '');
 if ($sub_path) {
 	$filepath = realpath(UOJContest::cur()->getResourcesPath(rawurldecode($sub_path)));
 	$realbasepath = realpath(UOJContest::cur()->getResourcesPath());
+	$filename = basename($filepath);
 
 	if (!strStartWith($filepath, $realbasepath)) {
 		UOJResponse::page406();
 	}
 
-	UOJResponse::xsendfile($filepath);
+	UOJResponse::xsendfile($filepath, [
+		'attachment' => $filename,
+	]);
 }
 
 $global_readonly = !UOJContest::cur()->userCanManage(Auth::user());